Complicated question but at the core did social just move towards search or did search become more social? Not to oversimplify the point but people like to buy from someone they know; they value the opinions of friends more than a website user, or Google search.
Facebook can connect and Google can’t. Clearly Facebook will face many small hurdles and it will take several attempts before they get it right but my money is on Facebook.
When people are looking for something the sweet words that they want to hear; “I’ve got a guy…”
Nothing can beat when a trusted friend says they know someone who can help you. Do you need to buy a car? Where is great place to eat sushi in Chicago? Can someone recommend a great Chiropractor? Think about the number of times in any given week you make an introduction for someone. Facebook is going to dominate search.